collision/index.html at master · bookofbash/collision · GitHub

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<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <title>Collision Game 1</title>
    <style>
        * { padding:0; margin: 0;}
        canvas { background: #eee; display: block; margin: auto; }
    </style>
</head>
<body>

<canvas id="myCanvas" width="480" height="320"></canvas>

<script>
    //Javascript goes here
var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var ballRadius = 10;
var x = canvas.width/2;
var y = canvas.height-30;
var dx =  2;
var dy =  -2;
//paddle size and mechanics
var paddleHeight = 10;
var paddleWidth = 100;
var paddleX = (canvas.width-paddleWidth)/2;
var rightPressed = false;
var leftPressed = false;
var shiftPressed = false;
// bricks
var brickRowCount = 3;
var brickColumnCount = 5;
var brickWidth = 75;
var brickHeight = 20;
var brickPadding = 10;
var brickOffsetTop = 30;
var brickOffsetLeft = 30;

//score
var score =0;

//lives
var lives = 3;
var bricks = [];
 for(c = 0; c < brickColumnCount; c++ ){
     bricks[c] = [];
     for(r = 0; r < brickRowCount; r++) {
         bricks[c][r] = {x: 0, y: 0, status: 1 };
     }
 }

document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, false);
document.addEventListener("mousemove", mouseMoveHandler, false);

function mouseMoveHandler(e) {
    var relativeX = e.clientX - canvas.offsetLeft;
    if(relativeX > 0 && relativeX < canvas.width) {
        paddleX = relativeX - paddleWidth/2;
    }
}

function keyDownHandler(e) {
    if(e.keyCode == 39){
        rightPressed = true;
    }
    else if (e.keyCode == 37) {
        leftPressed = true;
    }
}

function keyUpHandler(e) {
    if(e.keyCode == 39) {
        rightPressed = false;
    }
    else if (e.keyCode == 37) {
        leftPressed = false;
    }
}
function collisionDetection() {
    for (c=0;c<brickColumnCount; c++) {
        for(r=0; r< brickRowCount; r++){
            var b = bricks[c][r];
            if(b.status == 1){
                if(x > b.x && x < b.x + brickWidth && y > b.y && y < b.y +brickHeight){
                    dy = -dy;
                    b.status = 0;
                    score++;
                    if(score == brickRowCount * brickColumnCount){
                        alert("YOU WIN, CONGRATULAYIONS! Now go have some fun with your kids!");
                        document.location.reload();
                    }
                }
            }
        }
    }
}

function drawScore() {
    ctx.font = "16px Arial";
    ctx.fillStyle = "#5595DD";
    ctx.fill
    ctx.fillText("Score: "+score, 8, 20);
}

function drawLives() {
    ctx.font = "16px Arial";
    ctx.fillStyle = "#0095DD";
    ctx.fillText("Lives:"+lives, canvas.width-65, 20);
}

function drawBall() {
    ctx.beginPath();
    ctx.arc(x, y, ballRadius, 0, Math.PI*2);
    ctx.fllStyle = "#FF0000";
    ctx.fill();
    ctx.closePath();
}
function drawPaddle() {
    ctx.beginPath();
    ctx.rect(paddleX, canvas.height-paddleHeight, paddleWidth, paddleHeight);
    ctx.fillStyle = "#FF0000";
    ctx.fill();
    ctx.closePath();
}
function drawBricks() {
    for(c=0; c<brickColumnCount; c++) {
        for(r=0; r<brickRowCount; r++){
            if(bricks[c][r].status == 1){
                var brickX = (c*(brickWidth+brickPadding))+brickOffsetLeft;
                var brickY = (r*(brickHeight+brickPadding))+brickOffsetTop;
                bricks[c][r].x = brickX;
                bricks[c][r].y = brickY;
                ctx.beginPath();
                ctx.rect(brickX, brickY, brickWidth, brickHeight);
                ctx.fillStyle = "#0095DD";
                ctx.fill();
                ctx.closePath();
            }
        }
    }
}
function draw(){
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    drawBricks();
    drawBall();
    drawPaddle();
    drawScore();
    drawLives();
    collisionDetection();

    if(x + dx > canvas.width-ballRadius || x + dx < ballRadius) {
        dx = -dx;
    }
    if(y + dy < ballRadius){
        dy = -dy;
    } else if(y + dy > canvas.height-ballRadius) {
        if(x > paddleX && x < paddleX + paddleWidth){
            dy = -dy;
        }
        else {
            lives--;
            if(!lives) {
                alert("GAME OVER Aaron. You will never win!");
                document.location.reload();
            }
            else {
                x = canvas.width/2;
                y = canvas.height-30;
                dx = 2;
                dy = -2;
                paddleX = (canvas.width-paddleWidth)/2;
            }
        }
    }

    if(rightPressed && paddleX < canvas.width - paddleWidth) {
        paddleX += 7;
    }
    else if(leftPressed && paddleX > 0) {
        paddleX -= 7;
    }
    x += dx;
    y += dy;
    requestAnimationFrame(draw);
}


draw();
</script>
<h1>How to play</h1>
<h2>Use the Mouse or Left and Right arrow keys to move the red paddle</h2>
<h2>Break all the bricks and you win.</h2>
</body>
</html>